Laboratory of Applied Organic Chemistry (LCOA), Chemistry Department, Faculty of Sciences and Techniques, Sidi Mohamed Ben Abdellah University, Imouzzer Road, P.O. Box 2202, 30000 Fez, Morocco.
Engineering Laboratory of Organometallic, Molecular Materials and Environment (LIMOME), Faculty of Sciences, Chemistry Department, Sidi Mohamed Ben Abdellah University, P.O. Box 1796 (Atlas), 30000 Fez, Morocco.
Molecules. 2021 Mar 4;26(5):1378. doi: 10.3390/molecules26051378.
Removing methylene blue (MB) dye from aqueous solutions was examined by the use of nickel molybdate (α-NiMoO) as an adsorbent produced by an uncomplicated, rapid, and cost-effective method. Different results were produced by varying different parameters such as the pH, the adsorbent dose, the temperature, the contact time, and the initial dye concentration. Adsorbent dose and pH had a major removal effect on MB. Interestingly, a lower amount of adsorbent dose caused greater MB removal. The amount of removal gained was efficient and reached a 99% level with an initial methylene blue solution concentration of ≤160 ppm at pH 11. The kinetic studies indicated that the pseudo-second-order kinetic model relates very well with that of the obtained experimental results. The thermodynamic studies showed that removing the MB dye was favorable, spontaneous, and endothermic. Impressively, the highest quantity of removal amount of MB dye was 16,863 mg/g, as shown by the Langmuir model. The thermal regeneration tests revealed that the efficiency of removing MB (11,608 mg/g) was retained following three continuous rounds of recycled adsorbents. Adsorption of MB onto α-NiMoO nanoparticles and its regeneration were confirmed by Fourier transform infrared spectroscopy (FTIR) analysis and scanning electron microscopy (SEM) analysis. The results indicated that α-NiMoO nanosorbent is an outstanding and strong candidate that can be used for removing the maximum capacity of MB dye in wastewater.
采用钼酸镍（α-NiMoO）作为吸附剂，通过简单、快速且经济高效的方法从水溶液中去除亚甲蓝（MB）染料。通过改变不同的参数，如 pH 值、吸附剂剂量、温度、接触时间和初始染料浓度，得到了不同的结果。吸附剂剂量和 pH 值对 MB 的去除有很大的影响。有趣的是，少量的吸附剂剂量导致更大的 MB 去除。去除量的效率很高，在 pH 值为 11 时，初始亚甲蓝溶液浓度≤160ppm 时，去除率达到 99%。动力学研究表明，准二级动力学模型与实验结果非常吻合。热力学研究表明，去除 MB 染料是有利的、自发的和吸热的。令人印象深刻的是，Langmuir 模型表明，α-NiMoO 对 MB 染料的最大去除量为 16,863mg/g。热再生测试表明，经过三轮连续回收吸附剂后，去除 MB（11,608mg/g）的效率保持不变。通过傅里叶变换红外光谱（FTIR）分析和扫描电子显微镜（SEM）分析证实了 MB 吸附到α-NiMoO 纳米粒子上及其再生。结果表明，α-NiMoO 纳米吸附剂是一种出色且强大的候选物，可用于去除废水中最大容量的 MB 染料。
